A fully smooth self-engaging dry screw vacuum pump and its rotor

A screw vacuum pump and rotor technology, used in rotary piston pumps, components of pumping devices for elastic fluids, rotary piston/oscillating piston pump components, etc., can solve problems such as rotor leakage of dry screw vacuum pumps , to achieve the effect of short contact line, large inter-tooth area and high volumetric efficiency

Active Publication Date: 2022-03-18
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of leakage of the dry screw vacuum pump rotor in the prior art, to provide a fully smooth self-engaging dry screw vacuum pump and its rotor, and to improve the volumetric efficiency of the vacuum pump

Method used

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  • A fully smooth self-engaging dry screw vacuum pump and its rotor
  • A fully smooth self-engaging dry screw vacuum pump and its rotor
  • A fully smooth self-engaging dry screw vacuum pump and its rotor

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Effect test

Embodiment

[0060] Take the addendum arc radius R=65mm, dedendum arc r=33mm, and small arc rr=1mm as an example, the profile line and contact line are as follows figure 2 , image 3 , Figure 4 as well as Figure 5 shown. The center distance of the male and female rotors in the rotor profile of the dry screw vacuum pump is:

[0061] A=R+r=98mm

[0062] The equation of the arc cycloid segment b'c' meshing with the corrected arc segment a'b' is:

[0063]

[0064] The equation of the modified arc segment a'b' is:

[0065]

[0066] where O 1 =(a,b)=(1.3061,63.9867),

[0067] The center of the circle is the intersection of the curve equidistant 1mm outside the arc cycloid segment b'c' and the circle with a radius of 64mm.

[0068] The arc cycloid segment b'c' is tangent to the circle of the corrected arc segment a'b', and the tangent point is N, and the coordinates of N points are brought into the equation of the corrected arc segment a'b' and the arc cycloid segment b The eq...

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Abstract

A fully smooth self-meshing dry screw vacuum pump and its rotor. The male and female rotors have the same profile, and the profile includes sequentially connected corrected arc segments a'b', arc cycloid segments b'c', and dedendum arc segments. c'd', snail line segment d'e', snail line conjugate curve segment e'f' and addendum arc segment f'a', wherein the corrected arc segment a'b' of one rotor is related to the other The arc cycloidal segments b'c' of the rotors mesh with each other, and the rest of the line segments mesh with each other according to the respective rotation directions of the male and female rotors. The present invention also provides a dry screw vacuum pump, the rotor of which is the fully smooth self-engaging dry screw vacuum pump rotor. The male and female rotors of the present invention can achieve no leakage and full meshing when working, which is convenient for processing and manufacturing. The spiral line and its conjugate curve are used in the middle of the dedendum arc and the addendum arc, the contact line is short, and the area between the teeth is large, which makes the vacuum pump have higher volumetric efficiency.

Description

technical field [0001] The invention belongs to the field of mechanical engineering, and in particular relates to a fully smooth self-engaging dry screw vacuum pump and a rotor thereof. Background technique [0002] In recent years, with the vigorous development of semiconductor industry, microelectronics industry and IT industry, the requirements for vacuum environment have been increasing, and dry vacuum pumps have emerged as the times require. Dry vacuum pump has many advantages such as low-carbon environmental protection, oil-free operation, stability and high efficiency, strong adaptability, etc., especially in the working process, it does not need any other media in the pump cavity, and truly realizes the "dry mode" operation , It also fundamentally solves the problem of oil and gas pollution in the vacuum chamber. [0003] The screw vacuum pump is an air pumping device that produces suction and exhaust through the synchronous high-speed reverse rotation of the rotor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C29/00F04C18/16F04C25/02
CPCF04C18/082F04C18/16F04C25/02F04C2240/20F04C2250/20
Inventor 马凯郭蓓周宇航王岩彬
Owner XI AN JIAOTONG UNIV
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